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三维针刺C/SiC刹车材料的热物理性能

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Keywords: 三维针刺C/SiC,刹车材料,热物理性能,化学气相渗透,反应熔体浸渗

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Abstract:

通过化学气相渗透(CVI)法结合反应熔体浸渗(RMI)法制备了三维针刺C/SiC刹车材料,系统研究了三维针刺C/SiC刹车材料的热物理性能。结果表明:C/SiC刹车材料的热膨胀系数随温度升高总体呈增大趋势,但呈规律性波动;在相同温度下,垂直于摩擦面方向的热膨胀系数远大于平行方向的。从室温至1300℃,平行和垂直于摩擦面方向的平均热膨胀系数分别为1.75×10-6K-1和4.41×10-6K-1;C/SiC刹车材料的比定压热容随温度的升高而增大,但增大速率逐渐减小。温度从100℃升到1400℃,其比定压热容从1.41J/(g·K)增大到1.92J/(g·K);C/SiC刹车材料的热扩散率随温度的升高而降低,并趋于常量。平行于摩擦面方向的热扩散率明显大于垂直于摩擦面方向的热扩散率。

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